Monroe 34798 Gas-Magnum Truck Shock Absorber Sold Individually All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction Full Displaced Valving: Better valving range on both the compression and extension cycles of the unit for a smooth comfortable ride Sintered Iron Piston: Stronger than traditional metals, enhances durability for longer service life Nitrogen Gas Charged: For improved ride and handling, helps maintain tire to road contact by reducing aeration 2" Reserve Tube: More fluid for more consistent performance